Fluid Mechanics Lesson Series - Lesson 05A: Conservation of Mass In this video, Professor Cimbala derives the control volume equation for conservation of mass by employing the Reynolds Transport Theorem of the previous lesson. He then shows various simplifications of this conservation equation and does two example problems: an unsteady case and a steady case. This video incorporates material from Sections 5-1 and 5-2 of the Fluid Mechanics textbook by Cengel and Cimbala. An Excel file listing of all the videos in this series can be found at . If you liked this video, please subscribe to Dr. Cimbala's YouTube channel at to be informed when new videos are posted. You can also watch all related short videos with one click by going to one of Dr. Cimbala's playlists: Fluid Mechanics Lesson Series: Two-Minute Bible Videos: Two-Minute Excel Tutorials: Two-Minute Fluid Mechanics: Two-Minute Math and Statistics Videos: Two-Minute Science Videos: Short Marshmallow Peep Videos: Thirty-Second Engineering: Dr. John M. Cimbala is Professor of Mechanical Engineering at Penn State. He is an educator, textbook author, Christian author, husband, father, and grandfather. He also created and maintains a website for helping people grow in their faith called Christian Faith Grower at His YouTube channel is at